这个自己的小项目要先告一段落了。可能还有许多bug。请见谅
删除学生功能
PHP:
// 这里是通过前端代码HTML中的 url 传过来的，用 $_GET 来获取(相关HTML代码可以看一下到主页看一下前几条博客)
if (empty($_GET['num'])) exit('<h1>找不到您要删除的学生的学号</h1>');
$num = $_GET['num'];
$connection = mysqli_connect('localhost', 'root', '密码', 'students_info_system');
if (!$connection) exit('<h1>连接数据库失败</h1>');
$query = mysqli_query($connection, "delete from students where num = {$num}");
if (!$query) exit('<h1>该学生信息查询失败</h1>');
// 注意：这里传入的是连接对象
$affected_rows = mysqli_affected_rows($connection);
if ($affected_rows !== 1) exit('<h1>删除失败</h1>');
header('Location: student_info.php');
编辑学生功能(整体上和添加学生功能差不到，稍微有些许变化)
HTML:
<!DOCTYPE html>
<html>
<head>
<meta charset="utf-8">
<title>编辑学生</title>
<link rel="stylesheet" type="text/css" href="css/Bootstrap.css" rel="external nofollow" >
</head>
<body>
<div class="container mt-3">
<h1 class="display-5 text-center">编辑学生</h1>
<?php if (isset($error_msg)): ?>
<div class="alert alert-danger"><?php echo $error_msg; ?></div>
<?php endif ?>
<div class="row mt-3">
<img src="<?php echo $current_student['photo']; ?>" alt="<?php echo $current_student['name']; ?>" width="100" height="488" class="col-sm-6">
<form action="<?php echo $_SERVER['PHP_SELF']; ?>?id=<?php echo $current_num; ?>" method="post" enctype="multipart/form-data" autocomplete="off" class="col-sm-6">
<div class="form-group">
<input type="number" name="num" class="form-control" placeholder="学号" value="<?php echo isset($_POST['num']) ? $_POST['num'] : $current_student['num']; ?>">
</div>
<div class="form-group">
<select class="form-control" name="system">
<option>请选择学院/系</option>
<option <?php echo $current_student['system'] === '电气工程学院' ? 'selected' : ''; ?>>电气工程学院</option>
<option <?php echo $current_student['system'] === '信息工程与艺术学院' ? 'selected' : ''; ?>>信息工程与艺术学院</option>
<option <?php echo $current_student['system'] === '国际教育学院' ? 'selected' : ''; ?>>国际教育学院</option>
<option <?php echo $current_student['system'] === '水利水电工程学院' ? 'selected' : ''; ?>>水利水电工程学院</option>
<option <?php echo $current_student['system'] === '测绘与市政工程学院' ? 'selected' : ''; ?>>测绘与市政工程学院</option>
<option <?php echo $current_student['system'] === '马克思主义学院' ? 'selected' : ''; ?>>马克思主义学院</option>
<option <?php echo $current_student['system'] === '建筑工程学院' ? 'selected' : ''; ?>>建筑工程学院</option>
<option <?php echo $current_student['system'] === '经济与管理学院' ? 'selected' : ''; ?>>经济与管理学院</option>
</select>
</div>
<div class="form-group">
<input type="text" name="class" class="form-control" placeholder="班级" value="<?php echo isset($_POST['class']) ? $_POST['class'] : $current_student['class']; ?>">
</div>
<div class="form-group">
<input type="text" name="name" class="form-control" placeholder="姓名" value="<?php echo isset($_POST['name']) ? $_POST['name'] : $current_student['name']; ?>">
</div>
<div class="form-group">
<select class="form-control" name="gender">
<option value="-1">请选择性别</option>
<option <?php echo $current_student['gender'] === '1' ? 'selected' : ''; ?> value="1">男</option>
<option <?php echo $current_student['gender'] === '0' ? 'selected' : ''; ?> value="0">女</option>
</select>
</div>
<div class="form-group">
<label for="birthday">出生日期</label>
<input type="date" name="birthday" class="form-control" id="birthday" value="<?php echo isset($_POST['birthday']) ? $_POST['birthday'] : $current_student['birthday']; ?>">
</div>
<div class="form-group">
<label for="photo">照片</label>
<input type="file" name="photo" class="form-control">
</div>
<button type="submit" class="btn btn-info btn-block">确认修改</button>
</form>
</div>
</div>
</body>
</html>
PHP:
if (empty($_GET['id'])) exit('<h1>必须指定相应的学号</h1>');
$current_num = $_GET['id'];
$connection = mysqli_connect('localhost', 'root', '密码', 'students_info_system');
if (!$connection) exit('<h1>连接数据库失败</h1>');
$query = mysqli_query($connection, "select * from students where num = {$current_num} limit 1");
if (!$query) exit('<h1>找不到您要编辑的学生信息</h1>');
$current_student = mysqli_fetch_assoc($query);
// var_dump($current_student);
function edit_student() {
// var_dump('进来了');
global $connection;
global $current_num; // 当前学生学号
global $current_student;
$extra_students_query = mysqli_query($connection, "select * from students where num != {$current_num}");
if (!$extra_students_query) {
exit('<h1>其余学生数据查询失败</h1>');
// return;
}
// 查询除该学生以外的其他学生
while ($student = mysqli_fetch_assoc($extra_students_query)) {
// var_dump($student);
$students_num[] = $student['num'];
}
// var_dump($students_num);
// var_dump($_FILES['photo']);
// var_dump($_POST['gender']);
if (empty($_POST['num'])) {
$GLOBALS['error_msg'] = '请输入学号';
return;
}
// 判断该学号是否已经被添加(即列表中已存在该学生)=========
if (in_array($_POST['num'], $students_num)) {
$GLOBALS['error_msg'] = '该学生已存在';
return;
}
if (empty($_POST['system']) || $_POST['system'] === '请选择学院/系') {
$GLOBALS['error_msg'] = '请选择学院/系';
return;
}
if (empty($_POST['class'])) {
$GLOBALS['error_msg'] = '请输入班级';
return;
}
if (empty($_POST['name'])) {
$GLOBALS['error_msg'] = '请输入姓名';
return;
}
if (!(isset($_POST['gender']) && $_POST['gender'] !== '-1')) {
$GLOBALS['error_msg'] = '请选择性别';
return;
}
if (empty($_POST['birthday'])) {
$GLOBALS['error_msg'] = '请输入出生日期';
return;
}
// 以下处理文件域=======================================================
// 当有文件上传时才验证，没有上传则照片不变
// $_FILES['photo'] = $current_student['photo'];
// var_dump($_FILES['photo']);
if ($_FILES['photo']['name'] !== '') {
// var_dump($_FILES['photo']);
// var_dump($_FILES['photo']);
if ($_FILES['photo']['error'] !== UPLOAD_ERR_OK) {
$GLOBALS['error_msg'] = '上传照片失败';
return;
}
// 验证上传文件的类型(只允许图片)
if (strpos($_FILES['photo']['type'], 'image/') !== 0) {
$GLOBALS['error_msg'] = '这不是支持的文件格式类型，请重新上传';
return;
}
// 文件上传到了服务端开辟的一个临时地址，需要转移到本地
$image_target = 'images/' . $_FILES['photo']['name'];
if (!move_uploaded_file($_FILES['photo']['tmp_name'], $image_target)) {
$GLOBALS['error_msg'] = '图片上传失败';
return;
}
// 接收更新过的学生照片
$current_student['photo'] = (string)$image_target;
} else {
// var_dump($_FILES['photo']);
// 如果照片没有上传则不进行验证文件域,直接更新数据且不改变原来的照片
$current_student['num'] = $_POST['num'];
$current_student['system'] = $_POST['system'];
$current_student['class'] = $_POST['class'];
$current_student['name'] = $_POST['name'];
$current_student['gender'] = $_POST['gender'];
$current_student['birthday'] = $_POST['birthday'];
}
// var_dump($current_num);
// 将数据修改存放到数据库
$update_query = mysqli_query($connection, "update students set `num` = '{$current_student['num']}', `system` = '{$current_student['system']}', `class` = '{$current_student['class']}', `name` = '{$current_student['name']}', `gender` = '{$current_student['gender']}', `birthday` = '{$current_student['birthday']}', `photo` = '{$current_student['photo']}' where `num` = {$current_num}");
if (!$update_query) {
$GLOBALS['error_msg'] = '更新数据查询失败';
return;
}
$affected_rows = mysqli_affected_rows($connection);
if ($affected_rows !== 1) {
$GLOBALS['error_msg'] = '修改失败';
return;
}
// 延迟2秒
time_sleep_until(time() + 2);
header('Location: student_info.php');
}
if ($_SERVER['REQUEST_METHOD'] === 'POST') {
edit_student();
}
搜索功能（用js）
// 关键词搜索功能----立即函数
(function (element, search_key) {
let table = document.getElementById('table-content'); // 获取表格
function in_array_item (item, array) {
for (var i = 0; i < array.length; i++) {
if (array[i].indexOf(item) != -1) {
return true;
}
}
return false;
}
function response () {
let hiddenStudentsNumber = 0; // 获取隐藏的学生个数(即表格隐藏行数)
// 获取要搜索的关键词
const search_content = document.getElementById(search_key).value;
// console.log(search_content);
// console.log(typeof(search_content));
let data = [];
// 遍历列表将数据存储到一个数组中
// 1.获取表格行数
for (let i = 0; i < table.children.length; i++) {
// 2.获取表格列数
for (let j = 0; j < table.children[i].children.length; j++) {
if (!data[i]) {
// 在数组中创键每一行内容存放的数组，用于存放一行数据
data[i] = new Array();
}
data[i][j] = table.children[i].children[j].innerHTML.toString();
// 3.存放数据
if (data[i][j] === '♂') {
data[i][j] = '男';
}
if (data[i][j] === '♀') {
data[i][j] = '女';
}
}
// console.log(data[i]);
if (search_content == '') {
table.children[i].style.display = '';
} else {
if (in_array_item(search_content, data[i])) {
table.children[i].style.display = '';
} else {
table.children[i].style.display = 'none';
hiddenStudentsNumber += 1;
}
}
}
console.log(hiddenStudentsNumber);
let str = "共有" + (table.children.length - hiddenStudentsNumber) + "名学生";
document.getElementById('students_number').innerHTML = str;
}
const searchButton = document.getElementById(element);
searchButton.addEventListener('click', function () {
response();
});
document.addEventListener('keydown', function (event) {
if (event.keyCode === 13) {
response();
}
});
let str = "共有" + table.children.length + "名学生";
document.getElementById('students_number').innerHTML = str;
})('search', 'search-key');
同时在原有的学生信息页面HTML添加：
<div class="row mt-3">
<a class="btn btn-info col-sm-2" style="margin-right: 28px; margin-left: 15px;" href="add_student.php" rel="external nofollow" >添加学生</a>
// 添加的
<button class="btn btn-info align-middle" id="students_number"></button>
<input type="text" class="form-control col-sm-6 ml-2" autocomplete="on" placeholder="请输入关键词" value="" id="search-key">
<button type="submit" class="btn btn-info col-sm-2 ml-2" id="search">点击搜索</button>
</div>
总结
以上所述是小编给大家介绍的PHP 结合 Boostrap 结合 js 实现学生列表删除编辑及搜索功能，希望对大家有所帮助，如果大家有任何疑问欢迎给我留言，小编会及时回复大家的！
